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Novel circular polarization (CP) design of planar annual-ring antenna with broadband operation for UHF RFID system is proposed and experimentally studied. By introducing the Wilkinson divider into the feeding network and dual L-shaped strips, the proposed CP design can easily be achieved with the impedance bandwidth (RL ≧10 dB) of about 246 MHz (25.0% @ 985 MHz) and the 3 dB axial-ratio (AR) bandwidth...
This paper presents a compact design of circularly-polarized (CP) shaped-beam antenna array for RFID reader applications at 2.4 GHz. Aperture-coupled patch configuration using ring radiator was adopted as the array element with L-shaped aperture to maintain good axial ratio of the single element. A 10-degree down-tilt in the main beam was realized through synthesized amplitude and phase distributions...
This paper presents a novel design of dual-band and circularly-polarized antenna for RFID reader applications. Aperture-coupled ring radiators at 900MHz and 2.4GHz were adopted for dual-band operation. The coupling apertures were arranged orthogonally with proper phase offset to achieve circular polarization (CP) at both bands. The fabricated prototype exhibited good impedance bandwidth covering both...
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